Package org.locationtech.jts.operation.valid

Class ConnectedInteriorTester

java.lang.Object

org.locationtech.jts.operation.valid.ConnectedInteriorTester

public class ConnectedInteriorTester
extends Object

This class tests that the interior of an area Geometry ( Polygon or MultiPolygon ) is connected. This can happen if:

• a shell self-intersects
• one or more holes form a connected chain touching a shell at two different points
• one or more holes form a ring around a subset of the interior

If a disconnected situation is found the location of the problem is recorded.

Version:

1.7

Field Summary

Fields

Modifier and Type	Field	Description
private Coordinate	disconnectedRingcoord
private GeometryFactory	geometryFactory
private GeometryGraph	geomGraph

Constructor Summary

Constructors

Constructor	Description
ConnectedInteriorTester(GeometryGraph geomGraph)

Method Summary

Modifier and Type	Method	Description
private List	buildEdgeRings(Collection dirEdges)	Form DirectedEdges in graph into Minimal EdgeRings.
static Coordinate	findDifferentPoint(Coordinate[] coord, Coordinate pt)
Coordinate	getCoordinate()
private boolean	hasUnvisitedShellEdge(List edgeRings)	Check if any shell ring has an unvisited edge.
boolean	isInteriorsConnected()
private void	setInteriorEdgesInResult(PlanarGraph graph)
private void	visitInteriorRing(LineString ring, PlanarGraph graph)
protected void	visitLinkedDirectedEdges(DirectedEdge start)
private void	visitShellInteriors(Geometry g, PlanarGraph graph)	Mark all the edges for the edgeRings corresponding to the shells of the input polygons.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

geometryFactory

private GeometryFactory geometryFactory

geomGraph

private GeometryGraph geomGraph

disconnectedRingcoord

private Coordinate disconnectedRingcoord

Constructor Details

ConnectedInteriorTester

public ConnectedInteriorTester(GeometryGraph geomGraph)

Method Details

findDifferentPoint

public static Coordinate findDifferentPoint(Coordinate[] coord,
 Coordinate pt)

getCoordinate

public Coordinate getCoordinate()

isInteriorsConnected

public boolean isInteriorsConnected()

setInteriorEdgesInResult

private void setInteriorEdgesInResult(PlanarGraph graph)

buildEdgeRings

private List buildEdgeRings(Collection dirEdges)

Form DirectedEdges in graph into Minimal EdgeRings. (Minimal Edgerings must be used, because only they are guaranteed to provide a correct isHole computation)

visitShellInteriors

private void visitShellInteriors(Geometry g,
 PlanarGraph graph)

Mark all the edges for the edgeRings corresponding to the shells of the input polygons. Only ONE ring gets marked for each shell - if there are others which remain unmarked this indicates a disconnected interior.

visitInteriorRing

private void visitInteriorRing(LineString ring,
 PlanarGraph graph)

visitLinkedDirectedEdges

protected void visitLinkedDirectedEdges(DirectedEdge start)

hasUnvisitedShellEdge

private boolean hasUnvisitedShellEdge(List edgeRings)

Check if any shell ring has an unvisited edge. A shell ring is a ring which is not a hole and which has the interior of the parent area on the RHS. (Note that there may be non-hole rings with the interior on the LHS, since the interior of holes will also be polygonized into CW rings by the linkAllDirectedEdges() step)

Returns:

true if there is an unvisited edge in a non-hole ring